Possible Virus

It seems I have a virus, I keep getting "mail returned to sender" & when I scroll down, there is a lengthy amount of complete "gobbledygook";- letters / numerals, all mixed up,& the returner, [here it's the Postmaster General] usually states that the message was "probably generated by a virus"
The email address that it says it is returned from, I don't recognise at all, it is different each time. It has just started happening, just as I seem to have got rid of the so-called "sex aid" ads!!!
By my description, do you recognise it, is it a known virus?

The email you received was probably returned to you because someone spoofed yer address- put your addy in the 'from' field and attached a virus to the email. Some servers will block known virus attachments and send an email to the sender notifying them that they may have a virus. I get 10-20 of these a day lately.

The other option is that you indeed have a virus so why dont you update your AV software and run a complete scan.